An internet forum Jargon term defining the first post on any given page of a thread.
The term "stooper" is associated with the adjective "ganked" (see example). A "stooper" is significant, because when a post is located at the top of a page, it will be seen (by most users) every time the page is loaded.
:: in a forum conversation, as if this were top of page ::
Swood: I disagree, the Shins pretty much such my nuts. I hope they never come back to concert in Minneapolis.
Woogums: Ohhh Swood.. you just ganked the stooper..